My parents are both 80 this year. Dad is more or less hale and hearty although not capable of the 10 mile walks he used to do a few years ago. Their aged JRT is on his last legs sadly - incontinent, losing his sight and hearing and getting quite short-tempered. I suspect it won't be long before he has to be PTS. It will break dad's heart - not to mention mine and the DCs
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Dad has never been without a dog since he was a small child. I don't know how he'll cope without one but mum has said that when this one goes they can't have another one as they will be too old and 'anything happens to them' the dog will be homeless. The obvious solution to that is for us to take the dog when needed - we have discussed having a dog ourselves but so far the cons slightly outweight the pros. If it meant that dad could have a dog in his last years that would outweigh the cons considerably.
But how well would that work? Would any dog happily transplant to a new home with cats and children, a smaller garden and owners out most of the day? He'd get lots of love and exercise when we were there. Can it work?